Abstract
1H-NMR study of a spin-1/2 triple-chain system Cu3(OH)4SO4, in which the realization of an `idle-spin' state has been suggested recently from neutron experiments, were carried out in the temperature range down to 1.4 K. In the experiments under about 1 T, we found a clear anomaly of the nuclear magnetic relaxation rate and drastic change of the spectrum at around TN = 5.4 K. NMR spectrum below TN has a characteristic shape of an antiferromagnetic ordered state. This low-temperature spectrum is consistently reproduced by the calculation of local fields at proton sites on the basis of the idel-spin state. Further, TN decreased as the applied field is increased up to 6.9 T.
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